Hey guys, so this is my first attempt on an SCP. I couldn't find any similar ones so I'm sorry if there are similarities to other ones.http://scpsandbox2.wikidot.com/kabersch
I'm from Germany so there might be a few spelling mistakes or incorrect phrases.
Feedback is always appreciated and I'd love to hear some ideas to make my SCP more interesting!

You don't have to be this specific with the room measurements. The only time these measurements have to be super specific is when a mistake in the room size could result in it escaping. Otherwise, saying how big the room has to be is pointless. You can just say 'a standard humanoid containment cell.'

leading to an outside-area

What do you mean by this? 'Outside area' isn't very specific. Do you mean four walls with a grass floor and an open roof? Do you mean a room identical to the inside room, but made out of strong glass?

In the weeks the transportation to it's new location was prepared, it got more and more aggressive and tried to break free from it's room several times

The main goal of the foundation is to keep things locked up so that they can't do damage; the only time they would grant requests (like giving it an 'outside room') would be if it made the object easier to keep contained. Otherwise, they would simply put more restraints on it. I suggest that you put a sentence or two in here saying that it gets to go outside on the condition that it behaves and cooperates.

This is a good beginning of an idea, but it's not interesting. All I can see about it right now is that it's a creepy, powerful guy who knows stuff that he shouldn't know. If you were to spice it up a little, it would grab a reader's attention more. I don't have any specific suggestions for you, but I bet that the more experienced site members could have some tips on what catches peoples' eyes.

No offense, but it's quite apparent that english isn't your first language. I know how you feel- I'm polish, actually. I think it would be a good idea to have someone help you with your grammar syntax in a lot more depth than what I covered in my brief critique (which was mainly focused on conceptual things, not grammar).

Thanks for your reply, I will look over the SCP again and I'll try to make it sound more interesting, both from the description of it's abilities (giving it less of a human appearance) and from the grammar I use.Edit: I started to go over the article to make use of more interesting formulations and also make it sound more like an official report. I'll probably do this several times in the next days / weeks and will inform you once I think it's better.